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하소온도변화에 따른 초음파절삭기용 PMN-PNN-PZT 세라믹스의 압전 및 유전 특성
류주현,김승원,서동희,이은섭,최낙구,정회승,Yoo, Ju-Hyun,Kim, Seung-Won,Seo, Dong-Hi,Lee, Eun-Sup,Choi, Nak-Gu,Jeong, Hoy-Seung 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.3
In this paper, $Pb(Mn_{1/3}Nb_{2/3})_{0.07}(Ni_{1/3}Nb_{2/3})_{0.10}(Zr_{0.5}Ti_{0.5})_{0.83}O_3$ ceramics were fabricated by the conventional solid state method to obtain excellent dielectric properties for ultrasonic generators. The effects of 2nd calcination temperature on their microstructure and piezoelectric properties were systematically investigated. The tetragonality increased in the ceramics when 2nd calcination temperature increased to the optimized temperature at $750^{\circ}C$. At that temperature, excellent physical properties ($d_{33}=352\;pC/N$, ${\varepsilon}_r=1,687$, $k_p=0.570$, $Q_m=1,640$) were obtained for ultrasonic generator application.
음향 방출 센서용 Pb(Zn,Ni,Nb)O<sub>3</sub>-Pb(Zr,Ti)O<sub>3</sub> 세라믹스의 유전 및 압전 특성
한종대,류주현,정회승,서동희,Han, Jong-Dae,Yoo, Ju-Hyun,Jeong, Hoy-Seung,Seo, Dong-Hir 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.8
In this study, in order to develop composition ceramics for Acoustic Emission (abbreviated as AE) sensor application, the PZT system ceramics was fabricated by conventional solid state reaction method. When x=0.48, the density, electromechanical coupling factor($k_p$), piezoelectric coefficient $d_{33}$ and piezoelectric voltage constant $g_{33}$ of the maximum values of $7.857g/cm^3$, 0.51, 190[pC/N], 52[$10^{-3}mV/N$] were obtained, respectively, suitable for AE sensor.
Physical Properties of PNN-PMN-PZT Doped with Zinc Oxide and CLBO for Ultrasonic Transducer
Yoo, Juhyun,Kim, Tahee,Lee, Eunsup,Choi, Nak-Gu,Jeong, Hoy-Seung The Korean Institute of Electrical and Electronic 2017 Transactions on Electrical and Electronic Material Vol.18 No.6
In this paper, to develop the ceramics with high $d_{33}$ and high $Q_m$ for ultrasonic transducer applications, $0.10Pb(Ni_{1/3}Nb_{2/3})O_3-0.07Pb(Mn_{1/3}Nb_{2/3})O_3-0.83Pb(Zr_{0.5}Ti_{0.5})_{0.83}O_3$ (PNN-PMN-PZT) ceramics were sintered at $940^{\circ}C$ using $CuO-Li_2CO_3-Bi_2O_3$ (CLBO) as a sintering aid by a traditional solid-state technique. The influence of zinc oxide additive on the physical properties of the prepared ceramics were systematically investigated. The R-T (rhombohedral-tetragonal) phase coexistence was found in the ceramics without zinc oxide additive and with increasing amounts of ZnO additive, the specimens showed a tetragonal phase. The formation of a liquid phase between ZnO and $Bi_2O_3$ contributed significantly to the grain growth of specimens. For the 0.1 wt% ZnO ceramics, the optimal physical properties of $d_{33}=370pC/N$, ${\varepsilon}_r=1,344$, $k_p=0.621$, and $Q_m=1,523$ were obtained.